I have ZBrush. So can talk only about this software. What I love about it is… free updates and grate support. I bought it dirty cheap (look on zb forums sometimes guys are selling their license and you can get sweet deal). I bought it when it was version 3 now its 4 and soon 4.5 and still free updates ! So I would say you better give some money to the guys who really made awesome piece of software instead of greedy autodesk 